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// ancestors.rs
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//
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// Copyright 2018 Georges Racinet <gracinet@anybox.fr>
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//
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// This software may be used and distributed according to the terms of the
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// GNU General Public License version 2 or any later version.
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//! Bindings for the `hg::ancestors` module provided by the
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//! `hg-core` crate. From Python, this will be seen as `rustext.ancestor`
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//! and can be used as replacement for the the pure `ancestor` Python module.
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//!
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//! # Classes visible from Python:
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//! - [`LazyAncestors`] is the Rust implementation of
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//! `mercurial.ancestor.lazyancestors`. The only difference is that it is
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//! instantiated with a C `parsers.index` instance instead of a parents
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//! function.
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//!
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//! - [`MissingAncestors`] is the Rust implementation of
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//! `mercurial.ancestor.incrementalmissingancestors`.
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//!
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//! API differences:
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//! + it is instantiated with a C `parsers.index`
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//! instance instead of a parents function.
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//! + `MissingAncestors.bases` is a method returning a tuple instead of
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//! a set-valued attribute. We could return a Python set easily if our
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//! [PySet PR](https://github.com/dgrunwald/rust-cpython/pull/165)
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//! is accepted.
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//!
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//! - [`AncestorsIterator`] is the Rust counterpart of the
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//! `ancestor._lazyancestorsiter` Python generator. From Python, instances of
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//! this should be mainly obtained by calling `iter()` on a [`LazyAncestors`]
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//! instance.
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//!
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//! [`LazyAncestors`]: struct.LazyAncestors.html
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//! [`MissingAncestors`]: struct.MissingAncestors.html
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//! [`AncestorsIterator`]: struct.AncestorsIterator.html
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use crate::revlog::pyindex_to_graph;
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use crate::{
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cindex::Index, conversion::rev_pyiter_collect, exceptions::GraphError,
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};
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use cpython::{
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ObjectProtocol, PyClone, PyDict, PyList, PyModule, PyObject, PyResult,
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Python, PythonObject, ToPyObject,
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};
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use hg::Revision;
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use hg::{
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AncestorsIterator as CoreIterator, LazyAncestors as CoreLazy,
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MissingAncestors as CoreMissing,
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};
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use std::cell::RefCell;
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use std::collections::HashSet;
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py_class!(pub class AncestorsIterator |py| {
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data inner: RefCell<Box<CoreIterator<Index>>>;
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def __next__(&self) -> PyResult<Option<Revision>> {
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match self.inner(py).borrow_mut().next() {
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Some(Err(e)) => Err(GraphError::pynew(py, e)),
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None => Ok(None),
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Some(Ok(r)) => Ok(Some(r)),
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}
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}
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def __contains__(&self, rev: Revision) -> PyResult<bool> {
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self.inner(py).borrow_mut().contains(rev)
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.map_err(|e| GraphError::pynew(py, e))
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}
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def __iter__(&self) -> PyResult<Self> {
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Ok(self.clone_ref(py))
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}
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def __new__(_cls, index: PyObject, initrevs: PyObject, stoprev: Revision,
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inclusive: bool) -> PyResult<AncestorsIterator> {
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let initvec: Vec<Revision> = rev_pyiter_collect(py, &initrevs)?;
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let ait = CoreIterator::new(
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pyindex_to_graph(py, index)?,
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initvec,
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stoprev,
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inclusive,
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)
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.map_err(|e| GraphError::pynew(py, e))?;
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AncestorsIterator::from_inner(py, ait)
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}
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});
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impl AncestorsIterator {
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pub fn from_inner(py: Python, ait: CoreIterator<Index>) -> PyResult<Self> {
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Self::create_instance(py, RefCell::new(Box::new(ait)))
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}
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}
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py_class!(pub class LazyAncestors |py| {
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data inner: RefCell<Box<CoreLazy<Index>>>;
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def __contains__(&self, rev: Revision) -> PyResult<bool> {
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self.inner(py)
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.borrow_mut()
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.contains(rev)
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.map_err(|e| GraphError::pynew(py, e))
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}
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def __iter__(&self) -> PyResult<AncestorsIterator> {
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AncestorsIterator::from_inner(py, self.inner(py).borrow().iter())
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}
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def __bool__(&self) -> PyResult<bool> {
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Ok(!self.inner(py).borrow().is_empty())
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}
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def __new__(_cls, index: PyObject, initrevs: PyObject, stoprev: Revision,
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inclusive: bool) -> PyResult<Self> {
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let initvec: Vec<Revision> = rev_pyiter_collect(py, &initrevs)?;
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let lazy =
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CoreLazy::new(pyindex_to_graph(py, index)?,
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initvec, stoprev, inclusive)
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.map_err(|e| GraphError::pynew(py, e))?;
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Self::create_instance(py, RefCell::new(Box::new(lazy)))
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}
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});
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py_class!(pub class MissingAncestors |py| {
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data inner: RefCell<Box<CoreMissing<Index>>>;
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def __new__(
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_cls,
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index: PyObject,
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bases: PyObject
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)
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-> PyResult<MissingAncestors> {
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let bases_vec: Vec<Revision> = rev_pyiter_collect(py, &bases)?;
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let inner = CoreMissing::new(pyindex_to_graph(py, index)?, bases_vec);
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MissingAncestors::create_instance(py, RefCell::new(Box::new(inner)))
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}
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def hasbases(&self) -> PyResult<bool> {
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Ok(self.inner(py).borrow().has_bases())
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}
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def addbases(&self, bases: PyObject) -> PyResult<PyObject> {
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let mut inner = self.inner(py).borrow_mut();
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let bases_vec: Vec<Revision> = rev_pyiter_collect(py, &bases)?;
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inner.add_bases(bases_vec);
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// cpython doc has examples with PyResult<()> but this gives me
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// the trait `cpython::ToPyObject` is not implemented for `()`
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// so let's return an explicit None
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Ok(py.None())
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}
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def bases(&self) -> PyResult<HashSet<Revision>> {
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Ok(self.inner(py).borrow().get_bases().clone())
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}
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def basesheads(&self) -> PyResult<HashSet<Revision>> {
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let inner = self.inner(py).borrow();
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inner.bases_heads().map_err(|e| GraphError::pynew(py, e))
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}
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def removeancestorsfrom(&self, revs: PyObject) -> PyResult<PyObject> {
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let mut inner = self.inner(py).borrow_mut();
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// this is very lame: we convert to a Rust set, update it in place
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// and then convert back to Python, only to have Python remove the
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// excess (thankfully, Python is happy with a list or even an iterator)
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// Leads to improve this:
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// - have the CoreMissing instead do something emit revisions to
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// discard
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// - define a trait for sets of revisions in the core and implement
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// it for a Python set rewrapped with the GIL marker
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let mut revs_pyset: HashSet<Revision> = rev_pyiter_collect(py, &revs)?;
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inner.remove_ancestors_from(&mut revs_pyset)
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.map_err(|e| GraphError::pynew(py, e))?;
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// convert as Python list
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let mut remaining_pyint_vec: Vec<PyObject> = Vec::with_capacity(
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revs_pyset.len());
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for rev in revs_pyset {
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remaining_pyint_vec.push(rev.to_py_object(py).into_object());
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}
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let remaining_pylist = PyList::new(py, remaining_pyint_vec.as_slice());
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revs.call_method(py, "intersection_update", (remaining_pylist, ), None)
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}
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def missingancestors(&self, revs: PyObject) -> PyResult<PyList> {
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let mut inner = self.inner(py).borrow_mut();
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let revs_vec: Vec<Revision> = rev_pyiter_collect(py, &revs)?;
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let missing_vec = match inner.missing_ancestors(revs_vec) {
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Ok(missing) => missing,
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Err(e) => {
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return Err(GraphError::pynew(py, e));
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}
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};
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// convert as Python list
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let mut missing_pyint_vec: Vec<PyObject> = Vec::with_capacity(
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missing_vec.len());
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for rev in missing_vec {
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missing_pyint_vec.push(rev.to_py_object(py).into_object());
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}
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Ok(PyList::new(py, missing_pyint_vec.as_slice()))
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}
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});
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/// Create the module, with __package__ given from parent
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pub fn init_module(py: Python, package: &str) -> PyResult<PyModule> {
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let dotted_name = &format!("{}.ancestor", package);
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let m = PyModule::new(py, dotted_name)?;
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m.add(py, "__package__", package)?;
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m.add(
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py,
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"__doc__",
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"Generic DAG ancestor algorithms - Rust implementation",
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)?;
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m.add_class::<AncestorsIterator>(py)?;
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m.add_class::<LazyAncestors>(py)?;
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m.add_class::<MissingAncestors>(py)?;
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let sys = PyModule::import(py, "sys")?;
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let sys_modules: PyDict = sys.get(py, "modules")?.extract(py)?;
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sys_modules.set_item(py, dotted_name, &m)?;
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// Example C code (see pyexpat.c and import.c) will "give away the
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// reference", but we won't because it will be consumed once the
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// Rust PyObject is dropped.
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Ok(m)
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}
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